Gavin should be very pro-sidechains. It solves his need for scalability.

Many plug-ins can be installed on top of bitcoin.e.g. sidechain for local economy (town, country) .. "main" blockchain can remain small

how do you secure it?

This bitcoins/sidechain will be only for daily expenses. (you are not forced to use it, there will be fast confirmation time. And you can easy fund(and withdraw) to main chain. No other party is needed. You own the private keys. It is protocol feature)

Edit:Local merchant will do PoW to prevent double spent. They will not mine new bitcoins.

Gavin should be very pro-sidechains. It solves his need for scalability.

Many plug-ins can be installed on top of bitcoin.e.g. sidechain for local economy (town, country) .. "main" blockchain can remain small

how do you secure it?

Answer #25 companies or individuals create their own sidechain (they know each others, and they sign some agreement.)

- all transactions in their sidechain must be signed with all 5 parties (POS) -> in order to add in block- working hours 10 am - 6 pm

Edit:a) - "5 companies sidechain" do not have to be public (no one knows this sidechan exists). They only lock some bitcoins into "sidechain" ... only 5 signatures can unlock bitcoins in main chain - they can offer to their friends/customers service what moves bitcoins in 1 sec to any other of their customer (only 5 signatures are needed to confirm transaction in sidechain)

Who cares. This position is planned more than for decade (with stops in around 7k (LOL)). if for some reason gold will climb to 3000 tomorow not even one of my eyebrows will flinch.Typical long term trade.

Edit:While main protocol intact. No one have to bother with sidechain. Only use if you like feature of sidechain.

I just dont see it in sidechain, any sidechain features are limited by the reliance on Bitcoins POW Merge Mining, true innovation will be multifaceted, something a spin-off could seed.As for all the other endless opportunities, I see Open Transaction doing a better job in a trust less environment on top of (with) Bitcoin.